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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: ExprQueryJObjectContainer.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.gui;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import com.google.common.collect.Iterables;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.util.Collections;<a name="line.12"></a>
<span class="sourceLineNo">013</span><a name="line.13"></a>
<span class="sourceLineNo">014</span>import org.dellroad.stuff.vaadin7.VaadinApplicationListener;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import org.dellroad.stuff.vaadin7.VaadinConfigurable;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import org.jsimpledb.JObject;<a name="line.16"></a>
<span class="sourceLineNo">017</span>import org.jsimpledb.JSimpleDB;<a name="line.17"></a>
<span class="sourceLineNo">018</span>import org.jsimpledb.parse.ParseContext;<a name="line.18"></a>
<span class="sourceLineNo">019</span>import org.jsimpledb.parse.ParseException;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import org.jsimpledb.parse.ParseSession;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import org.jsimpledb.parse.expr.EvalException;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import org.jsimpledb.parse.expr.ExprParser;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import org.jsimpledb.parse.expr.Node;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import org.jsimpledb.util.CastFunction;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import org.springframework.beans.factory.annotation.Autowired;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import org.springframework.beans.factory.annotation.Qualifier;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.springframework.context.event.ApplicationEventMulticaster;<a name="line.27"></a>
<span class="sourceLineNo">028</span><a name="line.28"></a>
<span class="sourceLineNo">029</span>/**<a name="line.29"></a>
<span class="sourceLineNo">030</span> * {@link JObjectContainer} whose contents are determined by a Java expression.<a name="line.30"></a>
<span class="sourceLineNo">031</span> * Listens for {@link DataChangeEvent}s broadcast by an autowired {@link ApplicationEventMulticaster}.<a name="line.31"></a>
<span class="sourceLineNo">032</span> */<a name="line.32"></a>
<span class="sourceLineNo">033</span>@SuppressWarnings("serial")<a name="line.33"></a>
<span class="sourceLineNo">034</span>@VaadinConfigurable(preConstruction = true)<a name="line.34"></a>
<span class="sourceLineNo">035</span>public class ExprQueryJObjectContainer extends JObjectContainer {<a name="line.35"></a>
<span class="sourceLineNo">036</span><a name="line.36"></a>
<span class="sourceLineNo">037</span>    private final ParseSession session;<a name="line.37"></a>
<span class="sourceLineNo">038</span><a name="line.38"></a>
<span class="sourceLineNo">039</span>    private DataChangeListener dataChangeListener;<a name="line.39"></a>
<span class="sourceLineNo">040</span>    private String contentExpression;<a name="line.40"></a>
<span class="sourceLineNo">041</span><a name="line.41"></a>
<span class="sourceLineNo">042</span>    @Autowired(required = false)<a name="line.42"></a>
<span class="sourceLineNo">043</span>    @Qualifier("jsimpledbGuiEventMulticaster")<a name="line.43"></a>
<span class="sourceLineNo">044</span>    private ApplicationEventMulticaster eventMulticaster;<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span>    /**<a name="line.46"></a>
<span class="sourceLineNo">047</span>     * Constructor.<a name="line.47"></a>
<span class="sourceLineNo">048</span>     *<a name="line.48"></a>
<span class="sourceLineNo">049</span>     * @param jdb underlying database<a name="line.49"></a>
<span class="sourceLineNo">050</span>     * @param session session for parsing expressions<a name="line.50"></a>
<span class="sourceLineNo">051</span>     */<a name="line.51"></a>
<span class="sourceLineNo">052</span>    public ExprQueryJObjectContainer(JSimpleDB jdb, ParseSession session) {<a name="line.52"></a>
<span class="sourceLineNo">053</span>        this(jdb, null, session);<a name="line.53"></a>
<span class="sourceLineNo">054</span>    }<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span>    /**<a name="line.56"></a>
<span class="sourceLineNo">057</span>     * Constructor.<a name="line.57"></a>
<span class="sourceLineNo">058</span>     *<a name="line.58"></a>
<span class="sourceLineNo">059</span>     * @param jdb underlying database<a name="line.59"></a>
<span class="sourceLineNo">060</span>     * @param type type restriction, or null for no restriction<a name="line.60"></a>
<span class="sourceLineNo">061</span>     * @param session session for parsing expressions<a name="line.61"></a>
<span class="sourceLineNo">062</span>     */<a name="line.62"></a>
<span class="sourceLineNo">063</span>    public ExprQueryJObjectContainer(JSimpleDB jdb, Class&lt;?&gt; type, ParseSession session) {<a name="line.63"></a>
<span class="sourceLineNo">064</span>        super(jdb, type);<a name="line.64"></a>
<span class="sourceLineNo">065</span>        if (session == null)<a name="line.65"></a>
<span class="sourceLineNo">066</span>            throw new IllegalArgumentException("null session");<a name="line.66"></a>
<span class="sourceLineNo">067</span>        this.session = session;<a name="line.67"></a>
<span class="sourceLineNo">068</span>    }<a name="line.68"></a>
<span class="sourceLineNo">069</span><a name="line.69"></a>
<span class="sourceLineNo">070</span>    /**<a name="line.70"></a>
<span class="sourceLineNo">071</span>     * Configure the expression that returns this container's content. Container will automatically reload.<a name="line.71"></a>
<span class="sourceLineNo">072</span>     *<a name="line.72"></a>
<span class="sourceLineNo">073</span>     * @param contentExpression Java expression for container content<a name="line.73"></a>
<span class="sourceLineNo">074</span>     */<a name="line.74"></a>
<span class="sourceLineNo">075</span>    public void setContentExpression(String contentExpression) {<a name="line.75"></a>
<span class="sourceLineNo">076</span>        this.contentExpression = contentExpression;<a name="line.76"></a>
<span class="sourceLineNo">077</span>        this.reload();<a name="line.77"></a>
<span class="sourceLineNo">078</span>    }<a name="line.78"></a>
<span class="sourceLineNo">079</span><a name="line.79"></a>
<span class="sourceLineNo">080</span>    @Override<a name="line.80"></a>
<span class="sourceLineNo">081</span>    protected void doInTransaction(final Runnable action) {<a name="line.81"></a>
<span class="sourceLineNo">082</span>        this.session.perform(new ParseSession.Action() {<a name="line.82"></a>
<span class="sourceLineNo">083</span>            @Override<a name="line.83"></a>
<span class="sourceLineNo">084</span>            public void run(ParseSession session) {<a name="line.84"></a>
<span class="sourceLineNo">085</span>                action.run();<a name="line.85"></a>
<span class="sourceLineNo">086</span>            }<a name="line.86"></a>
<span class="sourceLineNo">087</span>        });<a name="line.87"></a>
<span class="sourceLineNo">088</span>    }<a name="line.88"></a>
<span class="sourceLineNo">089</span><a name="line.89"></a>
<span class="sourceLineNo">090</span>    @Override<a name="line.90"></a>
<span class="sourceLineNo">091</span>    protected Iterable&lt;? extends JObject&gt; queryForObjects() {<a name="line.91"></a>
<span class="sourceLineNo">092</span><a name="line.92"></a>
<span class="sourceLineNo">093</span>        // Any content?<a name="line.93"></a>
<span class="sourceLineNo">094</span>        if (this.contentExpression == null)<a name="line.94"></a>
<span class="sourceLineNo">095</span>            return Collections.&lt;JObject&gt;emptySet();<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span>        // Parse expression<a name="line.97"></a>
<span class="sourceLineNo">098</span>        final ParseContext ctx = new ParseContext(this.contentExpression);<a name="line.98"></a>
<span class="sourceLineNo">099</span>        final Node node = new ExprParser().parse(this.session, ctx, false);<a name="line.99"></a>
<span class="sourceLineNo">100</span>        ctx.skipWhitespace();<a name="line.100"></a>
<span class="sourceLineNo">101</span>        if (!ctx.isEOF())<a name="line.101"></a>
<span class="sourceLineNo">102</span>            throw new ParseException(ctx, "syntax error");<a name="line.102"></a>
<span class="sourceLineNo">103</span><a name="line.103"></a>
<span class="sourceLineNo">104</span>        // Evaluate parsed expression<a name="line.104"></a>
<span class="sourceLineNo">105</span>        final Object content = node.evaluate(this.session).get(this.session);<a name="line.105"></a>
<span class="sourceLineNo">106</span>        if (!(content instanceof Iterable)) {<a name="line.106"></a>
<span class="sourceLineNo">107</span>            throw new EvalException("expression must evaluate to an Iterable; found "<a name="line.107"></a>
<span class="sourceLineNo">108</span>              + (content != null ? content : "null") + " instead");<a name="line.108"></a>
<span class="sourceLineNo">109</span>        }<a name="line.109"></a>
<span class="sourceLineNo">110</span><a name="line.110"></a>
<span class="sourceLineNo">111</span>        // Reload container with results of expression<a name="line.111"></a>
<span class="sourceLineNo">112</span>        return Iterables.transform((Iterable&lt;?&gt;)content, new CastFunction&lt;JObject&gt;(JObject.class));<a name="line.112"></a>
<span class="sourceLineNo">113</span>    }<a name="line.113"></a>
<span class="sourceLineNo">114</span><a name="line.114"></a>
<span class="sourceLineNo">115</span>// Connectable<a name="line.115"></a>
<span class="sourceLineNo">116</span><a name="line.116"></a>
<span class="sourceLineNo">117</span>    @Override<a name="line.117"></a>
<span class="sourceLineNo">118</span>    public void connect() {<a name="line.118"></a>
<span class="sourceLineNo">119</span>        super.connect();<a name="line.119"></a>
<span class="sourceLineNo">120</span>        if (this.eventMulticaster != null) {<a name="line.120"></a>
<span class="sourceLineNo">121</span>            this.dataChangeListener = new DataChangeListener();<a name="line.121"></a>
<span class="sourceLineNo">122</span>            this.dataChangeListener.register();<a name="line.122"></a>
<span class="sourceLineNo">123</span>        }<a name="line.123"></a>
<span class="sourceLineNo">124</span>    }<a name="line.124"></a>
<span class="sourceLineNo">125</span><a name="line.125"></a>
<span class="sourceLineNo">126</span>    @Override<a name="line.126"></a>
<span class="sourceLineNo">127</span>    public void disconnect() {<a name="line.127"></a>
<span class="sourceLineNo">128</span>        if (this.dataChangeListener != null) {<a name="line.128"></a>
<span class="sourceLineNo">129</span>            this.dataChangeListener.unregister();<a name="line.129"></a>
<span class="sourceLineNo">130</span>            this.dataChangeListener = null;<a name="line.130"></a>
<span class="sourceLineNo">131</span>        }<a name="line.131"></a>
<span class="sourceLineNo">132</span>        super.disconnect();<a name="line.132"></a>
<span class="sourceLineNo">133</span>    }<a name="line.133"></a>
<span class="sourceLineNo">134</span><a name="line.134"></a>
<span class="sourceLineNo">135</span>// DataChangeListener<a name="line.135"></a>
<span class="sourceLineNo">136</span><a name="line.136"></a>
<span class="sourceLineNo">137</span>    private class DataChangeListener extends VaadinApplicationListener&lt;DataChangeEvent&gt; {<a name="line.137"></a>
<span class="sourceLineNo">138</span><a name="line.138"></a>
<span class="sourceLineNo">139</span>        DataChangeListener() {<a name="line.139"></a>
<span class="sourceLineNo">140</span>            super(ExprQueryJObjectContainer.this.eventMulticaster);<a name="line.140"></a>
<span class="sourceLineNo">141</span>            this.setAsynchronous(true);<a name="line.141"></a>
<span class="sourceLineNo">142</span>        }<a name="line.142"></a>
<span class="sourceLineNo">143</span><a name="line.143"></a>
<span class="sourceLineNo">144</span>        @Override<a name="line.144"></a>
<span class="sourceLineNo">145</span>        protected void onApplicationEventInternal(DataChangeEvent event) {<a name="line.145"></a>
<span class="sourceLineNo">146</span>            ExprQueryJObjectContainer.this.handleChange(event.getChange());<a name="line.146"></a>
<span class="sourceLineNo">147</span>        }<a name="line.147"></a>
<span class="sourceLineNo">148</span>    }<a name="line.148"></a>
<span class="sourceLineNo">149</span>}<a name="line.149"></a>
<span class="sourceLineNo">150</span><a name="line.150"></a>




























































</pre>
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